Energy Measurement of Relativistic Electron Beams by Laser Compton Scattering

• Main Authors: Chu, Cha Ching, 朱家慶
• Other Authors: Hsu, C. Ian
• Format: Others
• Language: en_US
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/88008410507824639297

碩士 === 國立清華大學 === 原子科學研究所 === 84 === Laser Compton scattering by relativistic electrons provides the energy information associated with electron beams in an accelerator. Determining the electron beam energy by this method depends primarily on the signal to noise (S/N) ratio associated with laser Compton scattering. In this study, we propose a method to enhance the S/N ratio by synchronous measurement with a high peak power pulsed CO2 laser. In this method, the pulsed CO2 laser provides the gate trigger signals, and the delay times of the triggers are optimized to obtain a maximum S/N ratio. In the storage ring of Taiwan Light Source, a g-ray with the highest energy of 3.021MeV was back-scattered after the 0.1172eV CO2 laser photons colliding with the relativistic electrons. The S/N ratio is about 42.5 with the electron beam current being 19mA. Also, the measured electron beam energy is 1.3058GeV with relative uncertainty 0.13%.